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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

I am working through Jeremy Garcia's article on setting Squid up to use WCCP redirection. I have been able to do everything except get the GRE tunnel to configure correctly. I am sure I am missing a step somewhere, but haven't been able to track it down.

When I issue the command:

iptunnel add gre1 mode gre remote x.x.x.x local x.x.x.x dev eth0

it comes back and tells me ioctl: No such device.

My problem is, I did get it to work once, but after rebooting the box, keep getting that message.